Selective hydrogenation of cinnamaldehyde over Pt nanoparticles deposited on reduced graphene oxide

Platinum nanocrystals supported on CoAl mixed metal oxide nanosheets derived from layered double hydroxides as catalysts for selective hydrogenation of cinnamaldehyde

“…The hydrogenation over Pt/CoAl-MMO and Pt/ CoAl-LDH catalysts affords COL with 75.9 and 74.2% selectivity with a reaction conversion of 93.1 and 94.3%, respectively. They present higher conversion and selectivity than that obtained over conventional Pt/CNTs (conversion 87.2% and selectivity 48.3%) [14] and higher conversion than that catalyzed on Pt/SBA-15 (conversion 16%) [15]. Though Pt/NiAl-MMO and Pt/NiAl-LDH achieve high conversion, poor selectivity is obtained simultaneously.…”

“…This is a feasible way to search for appropriate materials used as catalyst supports for preparing highly active and selective catalysts for the hydrogenation of CAL. Traditional carbon materials, such as activated carbon, carbon aerogel [13], and CNTs [14], and SiO 2 [8,15] have been widely used as catalyst supports. However, there is little metal-support interaction effect among the catalysts because of the almost electroneutral surface of the support, resulting in low conversion and poor selectivity.…”

Three‐Dimensionally Hierarchical Pt/C Nanocomposite with Ultra‐High Dispersion of Pt Nanoparticles as a Highly Efficient Catalyst for Chemoselective Cinnamaldehyde Hydrogenation

“…Carbon materials have been testified to be one of the best choicesa st he catalyst support for hetero-geneous reactions in the liquid phase owing to their excellent mechanical strengtha nd stabilityu nder hydrothermal conditions, good electronic properties, large surface area for dispersing activec omponents, easy recovery-refining-recycling for precious metals,r elatively low cost as well as versatile existing forms. [3] Over the past years, variousc arbon-supported Pt (Pt/ C) catalysts, includingP t/carbon nanotubes (CNTs), [4][5][6][7][8][9][10] Pt/ graphite, [11] Pt/graphene, [12][13][14] Pt/carbon nanofibers, [7,[15][16][17] Pt/ carbon aerogel and xerogel, [18,19] Pt/mesoporous carbon, [20] and Pt/hollow carbon spheres, [21] have been investigated for hydrogenationo fC MA towards CMO. Although enhanced performances in the catalytic activity and selectivity can be achieved with these Pt/C catalysts, they often suffer from somei ntrinsic defects:( i) the relativelyw eaki nteractions between the carbon scaffold with Pt as wella st he subsequent Pt detachment duringt he reaction;( ii)low Pt dispersion;( iii)random pore size distribution of the catalyst for low efficiency of mass transportation, all of which enormously inhibit the full active release of Pt.…”

Graphene-supported metal/metal oxide nanohybrids: synthesis and applications in heterogeneous catalysis

“…94,95 Many studies have been devoted to supported Pt catalysts because of their high activity and moderate selectivity. 97 The good dispersion of Pt/rGO in certain solvent may also contribute to the improved catalytic performance. 96 Despite the fact that comparable conversion was obtained over the graphene-and AC-supported catalysts, a dramatic difference was observed in the selectivity towards COL, that is, 88% vs. 27%, respectively, when the reaction was conducted at 333 K for 4 h. The superior selectivity of Pt/G was attributed to the higher fraction of reduced surface Pt 0 as revealed by XPS, and this interpretation is consistent with first-principles calculations.…”